A personal favourite from the school yard, and particularly apt following the 'poo-gate' saga ...
It slips and slides,
Down our back-sides,
Diarrhoea ... Diarrhoea,
If the smell doesn't linger,
Don't use paper,
Use your finger,
Diarrhoea ... Diarrhoea, etc.
Aah, it's like a hymn.